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Updated Transceiver Comparison (markdown)

akuker 2022-02-11 21:12:53 -06:00
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Transceiver-Comparison.md

@ -135,17 +135,77 @@ Switched by `PI-IND`:
# Detailed discusison/comparison
[Wikipedia list of 74xx logic parts](https://en.wikipedia.org/wiki/List_of_7400-series_integrated_circuits#74x200_%E2%80%93_74x299)
## 74xx series logic parts
| Product | Chip and Datasheet | Cost ($) | Qty needed | Notes |
| - | - | - | - | - |
| RaSCSI Original Version | [SN74LS641-1](https://www.mouser.com/ProductDetail/Texas-Instruments/SN74LS641-1DW?qs=SL3LIuy2dWxXHvPKLk%252BfLw%3D%3D) | 3.30 | 4 | VCC is 5v |
[Wikipedia list of 74xx logic parts](https://en.wikipedia.org/wiki/List_of_7400-series_integrated_circuits#74x200_%E2%80%93_74x299)
|Part number | Units | Description | Input | Output | Pins | Datasheet|
| ------------- | ----- | ------------- | ----- | ------------- | ----- | ---------|
| 74x125 | 4 | quad bus buffer, negative enable | | three-state | 14 | SN74LS125A |
| 74x126 | 4 | quad bus buffer, positive enable | | three-state | 14 | SN74LS126A |
| 74x245 | 8 | octal bus transceiver, non-inverting outputs | Schmitt trigger | three-state | 20 | SN74LS245 |
| 74x641 | 1 | octal bus transceiver, non-inverting outputs | | open-collector | 20 | SN74LS641 |
| 74x641 | 1 | octal bus transceiver, non-inverting outputs | | open-collector| 20 | SN74LS641 |
### Notes
## Logic Families
[Texas Instruments Logic guide](https://www.ti.com/lit/sg/sdyu001ab/sdyu001ab.pdf)
LS, LVTH, LVT, AHCT, F, AHC, ALS, F, ABT, HCT,
| Families | Voltage| Process | Bus-Hold |Series Damping | Resistors | IOFF | Schmitt Triggers |Overvoltagetolerant Inputs| Power-off Output Disable | Power-up 3-State|
|---------------|--------|----------|---|---|---|---|---|---|---|
| ABT | 5 | Bi-CMOS | X | X | | | | X | X |
| AHC | 3.3, 5 | CMOS | | | | | X | X | |
| AHCT/HCT | 5 | CMOS | | | | | X | X | |
| ALS | 5 | Bi-Polar | | | | | | | |
| F | 5 | Bi-Polar | | X | | | | | |
| LS | 5 | Bi-Polar | | | | | | | |
| LVT/LVTH * | 3.3 | Bi-CMOS | X | X | X | | | X | X |
| Families | Bus-Hold |Series Damping | Resistors | IOFF | Schmitt Triggers |Overvoltagetolerant Inputs| Power-off Output Disable | Power-up 3-State|
|---------------|----------|---------------|-----------|------|------------------|--------------------------|--------------------------|------------------|
| ABT |
| AHC |
| AHCT/HCT |
| ALS |
| F |
| LS |
| |
* LVT/LVTH: The original LVT devices had the bus-hold feature. The LVTH replacements for these devices not only have bus hold, but also
have the High-Impedance State During Power Up and Power Down feature
Encoders/
Decoders
Digital Comp/
Parity Gen.
Gates
Transceivers
Level Translators
Phase Lock Loops
Bus-Hold
Series Damping
Resistors
IOFF (Partial
Power Down)
Schmitt Triggers
Overvoltagetolerant Inputs
Power-off
Output Disable
Power-up 3-State
Bipolar
CMOS
B
## What about NTS0104?
# Notes
<a name="ref-1">(1)</a> [Comment by `saybur`](https://68kmla.org/forums/index.php?app=forums&module=forums&controller=topic&id=30399&page=7&tab=comments#comment-646496)